Binary package “chocolate-doom” in ubuntu oneiric

Doom engine closely-compatible with vanilla doom

Chocolate doom is a modern, cross-platform doom engine with
the major design goal of emulating the behaviour of vanilla
Doom as close as is possible. For example, chocolate doom
can read and write vanilla doom save games.
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Unlike most modern doom engines, chocolate doom is not
derived from the Boom source-port and does not inherit its
features (or bugs).
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Chocolate doom requires a doom-wad to play. If you have a copy
of the commercial games Doom or Doom 2, you can generate a
doom-wad package using "game-data-packager".